Our data is so weird. Papias *may* refer to two Johns - but the evidence Eusebius uses to deduce this is weak and ambiguous. Surely, if Papias were more clear elsewhere, Eusebius would have cited that instead.
The John that Papias spoke of was termed “The Elder.” That matches the epitaph of the shorter Johannine epistles.
But whoever wrote the Johannine epistles wrote the Gospel of John.
Papias was definitely familiar with the Gospel of John, as he lists the precise ordering of the apostles that John gives. Papias probably also said something about the composition of John, as he did about the other gospels. So it’s odd that Eusebius did not preserve what Papias said about the composition of John, unless Charles Hill is right to hold that Eusebius did, in fact, record it - but covertly, using Papias as an unnamed source.
But it strongly seems that whoever wrote the apocalypse did not write the rest of the Johannine literature. But the rest of the Johannine literature is emphatic about eye-witness testimony.
Yet it looks like the teachings Papias was notorious for are based on the book of Revelation - namely, Papias’s chilaism.
So we have two pieces of data pulling in opposite directions: “The Elder” epitaph points Papias linking himself to the gospel and shorter letters. The chiliasm links Papias to the book of Revelation. But the book of Revelation and the other Johannine literature is hard to reconcile as the work of a single author.
Irenaeus, who was familiar with Papias’s book, believes that the author of the Johannine literature was the apostle John and has no hint of a two-John theory.
Justin Martyr is explicit that the apocalypse was written by the apostle John.
The Apocryphon of John, a gnostic work that predates Ireneaus, also attributes the book to the apostle John, explicitly the Son of Zebedee.
Further, I’m strongly moved by the idea that “elder” was a late usage term for the apostles: Papias explicitly calls his list of apostles “the elders” and then calls John “the elder,” seemingly linking John with the preceding apostolic group.
Some hold that the apostle John, son of Zebedee, came to hold sway in the Ephesian area but that Papias did not directly know him, but one of his disciples also known as John, who lived into the 2nd century. Others, like Bauckham, hold that Papias’ mentor was indeed a different John but was still a disciple of Jesus, who wrote the gospel of John.
So despite this massively confusing evidence, I’m still heavily inclined towards the single author view of the Johannine literature, perhaps with John aided by an amanuensis for some of the literature (the gospel and shorter epistles? The apocalypse alone?).
Charles Hill argues that Eusebius is covertly using Papias as a source in 3.24, and that this usage shows that there’s a second John - for if this is a Papias quote, then Papias is quoting the Elder, and the Elder is referring to John in the third person, so it must be a distinct John. – Why couldn’t it just be Papias writing instead of directly quoting the elder?
Two Hypotheses:
First: Eusebius’s theory. Two Johns. Elder John wrote the apocalypse and knew the apostle. The apostle wrote the gospels and Johannine letters. We have the Elder's testimony preserved in Papias via Eusebius 3.24 concerning the composition of the gospel by the apostle.
Second hypothesis: One John, author of all of the Johannine literature. Ireneaus seemed to think this.
Justin Martyr lived in Ephesus for a time and explicitly claimed that the apocalypse was written by John the apostle and seemed also to think that the gospel was written by the apostle John.
Third hypothesis: Bauckman’s. The apostle falls out of view and the gospel/Johannine epistles are instead composed by the Elder John, who was a disciple of Jesus and known to Papias.
The evidence for two Johns:
The monuments
The Dionysius stylistic argument
The Ambiguous Papias quote
Contra: Jerome claimed that the two monuments were just both dedicated to the single apostle.
Philipe of Side claims from a purported Papias fragment that John son of Zebedee was martyred “by Jews,” explicitly linking this to Jesus' prophecy concerning the two brothers James and John. So John died early, and couldn't have written the gospel.
Contra: John son of Zebedee certainly didn't die with John in 44 A.D., given that Paul mentions him as a pillar of the church circa 50 A.D.
And Philip of Sides also claims in the De Boor fragments that a person died as a martyr that certainly did not - namely, Pierius. Jerome is clear that Pierius didn’t die as a martyr despite the claim of Philip of Side.
Also, why wouldn’t Eusebius have mentioned this from Papias if he had it in front of him? Luke Stevens uses this to argue that Eusebius didn’t know Papias first hand, but that seems wrong, for Eusebius claims Papias as “extant.”